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Greenspark.Group DOT Hazmat Reference

DOT Hazard Classes 1–9

Explore DOT hazard classes 1–9, major divisions, placards, and common materials. Search by material, UN/NA number, class, or hazard type.

Search Hazard Classes Reference Table Common Materials List
Reference only — verify before shipping.
Important reference note

Reference, not a classifier.

A material name alone may not determine its legal shipping classification. Verify the proper shipping description using the current SDS Section 14 and 49 CFR §172.101 Hazardous Materials Table.

DOT Hazard Class Explorer

Search DOT Hazard Classes & UN/NA Numbers

Search a material, UN/NA number, class, division, or hazard type. Matching classes and divisions are highlighted below.

Popular Hazard Lookups
Acetone Propane Sulfuric Acid Sodium Hydroxide Diesel Fuel Lithium Batteries UN3480 UN3481 Flammable Liquid Corrosive Oxidizer Automotive Batteries
SDS Section 14 is a starting point, not the final authority. Verify the final classification, proper shipping name, identification number, packing group (when assigned), labels/placards, and special provisions against the current SDS and 49 CFR §172.101 before shipping.

Quick Reference

DOT Hazard Classes 1–9 Chart & Reference Table

Use this table for fast orientation, then open the explorer above for divisions and material-specific notes.

ClassHazard typeMajor divisionsCommon examples
1ExplosivesDivision 1.1 explosives placard1.1–1.6Fireworks, blasting agents
2GasesDivision 2.2 non-flammable gas placard2.12.22.3Propane, nitrogen, chlorine
3Flammable liquidsClass 3 flammable liquid placard—Acetone, gasoline, ethanol
4Flammable solidsDivision 4.1 flammable solid placard4.14.24.3Flammable solids, self-heating materials, dangerous-when-wet materials
5Oxidizers & organic peroxidesDivision 5.1 oxidizer placard5.15.2Oxidizing substances, organic peroxides
6Toxic & infectious substancesDivision 6.1 toxic material placard6.16.2Toxic materials, infectious substances
7Radioactive materialClass 7 radioactive material placard—Regulated radioactive materials
8Corrosive materialClass 8 corrosive material placard—Acids, corrosive liquids and solids
9Miscellaneous hazardous materialClass 9 miscellaneous hazardous material placard—Lithium batteries, dry ice

DOT Hazard Class List for Common Hazardous Materials

Use this table as a fast starting point for common material searches. Some names map to a specific HMT entry, while others depend on concentration, chemistry, physical form or shipment conditions. Always verify the exact product in SDS Section 14 and the current 49 CFR §172.101 Hazardous Materials Table.

MaterialDOT hazard class / divisionUN / NA or qualifierImportant note
Acetic Acid Class 8 — Corrosive UN2789 / UN2790 Concentration changes the entry and packing group; stronger solutions can also carry a Class 3 subsidiary hazard.
Acetone Class 3 — Flammable Liquid UN1090 · PG II Direct HMT entry.
Acetonitrile Class 3 — Flammable Liquid UN1648 · PG II Direct HMT entry.
Ammonia / Anhydrous Ammonia Entry depends on regulatory context UN1005 The HMT contains differing domestic and international entries; do not assign the class from the product name alone.
Ammonium Nitrate Classification can branch UN1942 and other entries Composition and form matter; certain ammonium nitrate entries are Division 5.1 while others can fall in Class 1.
Aerosols Division 2.1 or 2.2 — contents-dependent UN1950 Aerosol classification depends on the contents and hazard characteristics; verify the exact UN1950 entry and applicable provisions.
Asbestos Class 9 — Miscellaneous NA2212 / UN2212 / UN2590 The applicable entry depends on asbestos type and transportation context.
Automotive Batteries Chemistry-specific Lead-acid and lithium entries differ Do not treat “automotive battery” as one universal hazmat classification.
Benzene Class 3 — Flammable Liquid UN1114 · PG II Direct HMT entry.
Bleach Product-specific Check the exact chemical and concentration “Bleach” is a product category, not one universal DOT shipping entry.
Chlorine Division 2.3 — Toxic Gas UN1017 The HMT also lists oxidizer and corrosive subsidiary hazards.
Chloroform Division 6.1 — Toxic UN1888 · PG III Direct HMT entry.
Dangerous When Wet Division 4.3 Hazard type, not one material Use the exact material entry to determine whether Division 4.3 applies.
Diesel Fuel Classification can branch UN1202 / NA1993 may be relevant Flash point, domestic provisions and shipment conditions can affect treatment.
Dry Ice Class 9 — Miscellaneous UN1845 Listed as Carbon dioxide, solid or Dry ice.
Ethanol / Ethyl Alcohol Class 3 — Flammable Liquid UN1170 Packing group can vary with the applicable solution entry.
Ethyl Acetate Class 3 — Flammable Liquid UN1173 · PG II Direct HMT entry.
Formaldehyde Solutions Classification can branch UN1198 / UN2209 may be relevant Flammability and concentration change the applicable entry and primary hazard.
Gasoline Class 3 — Flammable Liquid UN1203 · PG II Direct HMT entry for gasoline, including gasoline with not more than 10% ethanol.
Hydrochloric Acid / Muriatic Acid Class 8 — Corrosive UN1789 Packing Group II or III may apply depending on the material.
Hydrogen Peroxide Division 5.1 — Oxidizer UN2984 / UN2014 / UN2015 Concentration changes the entry, packing group and whether a Class 8 subsidiary hazard applies.
Isopropyl Alcohol / Isopropanol Class 3 — Flammable Liquid UN1219 · PG II Direct HMT entry for Isopropanol (Isopropyl alcohol).
Kerosene Class 3 — Flammable Liquid UN1223 · PG III Direct HMT entry.
Liquid Nitrogen Division 2.2 — Non-flammable Gas UN1977 Listed as Nitrogen, refrigerated liquid (cryogenic liquid).
Lithium Batteries Class 9 — Miscellaneous UN3480 / UN3481 / UN3090 / UN3091 Chemistry and whether batteries ship alone, packed with equipment or contained in equipment determine the entry. Special provisions and exceptions may apply (see 49 CFR §173.185), and requirements can differ by transport mode (ground, air, vessel). Verify the current requirements for your shipment.
LPG / Liquefied Petroleum Gas Division 2.1 — Flammable Gas UN1075 Use the specific LPG/petroleum-gas entry rather than assuming it is identical to pure propane.
Magnesium Form-dependent Class 4.1 or 4.3 entries may apply Powder, granules, turnings, ribbons, alloys and other forms can classify differently.
Methanol / Methyl Alcohol Class 3 — Flammable Liquid UN1230 · PG II The international-marked HMT entry also carries a Division 6.1 subsidiary hazard.
Nitric Acid Class 8 — Corrosive UN2031 / UN2032 Concentration and red-fuming condition can change packing group and subsidiary hazards.
Nitrogen Division 2.2 — Non-flammable Gas Compressed or refrigerated entries differ Use the physical-state-specific HMT entry.
Oily Rags Condition-dependent May involve Division 4.2 Do not assign a class from the phrase alone; the material condition and applicable entry matter.
Oxygen Division 2.2 with oxidizer subsidiary hazard UN1072 for compressed oxygen Physical state matters; refrigerated liquid oxygen uses a different entry.
Paint Formulation-dependent Multiple possible HMT entries Paints and coatings can classify differently based on formulation and physical properties.
Pesticides Product-specific Multiple classes and entries are possible Use the exact active material/product and SDS Section 14.
Potassium Hydroxide Class 8 — Corrosive UN1813 solid / UN1814 solution Solution entries can use Packing Group II or III.
Propane Division 2.1 — Flammable Gas UN1978 Direct HMT entry.
Sodium Hydroxide Class 8 — Corrosive UN1823 solid / UN1824 solution Solution entries can use Packing Group II or III.
Sodium Hypochlorite Solution Class 8 — Corrosive UN1791 · PG II or III Concentration and product properties affect the applicable packing group; verify the exact solution in the HMT and SDS.
Sulfuric Acid / Battery Acid Class 8 — Corrosive UN1830 / UN2796; other entries exist Concentration and fuming/spent condition change the applicable HMT entry.
UN3480 Class 9 — Lithium ion batteries UN3480 Used for lithium ion batteries shipped as batteries rather than packed with or contained in equipment.
UN3481 Class 9 — Lithium ion batteries UN3481 Used for lithium ion batteries packed with equipment or contained in equipment.

Freight Planning Calculators

Calculate and Plan Your Hazmat Freight Shipment

Use the freight class, density, pallet, and linear-feet calculators to plan packaged LTL shipments that may also require hazardous-material compliance review.

Explorer guide

How to Use the Hazard Class Explorer

  1. 1
    Search what you know.

    Enter a material name, UN/NA number, hazard class, division, or hazard type.

  2. 2
    Review the highlighted match.

    The explorer opens or highlights the related class and, when useful, the matching division.

  3. 3
    Open the class for context.

    Use the expanded class reference to review divisions, placard cues, examples, and shipment-specific notes.

Material names can branch. Concentration, chemistry, physical form, and shipment conditions can change the legal shipping classification.

Read the result

Class → Division → UN/NA Number

These identifiers answer different questions. A class describes the broad hazard; a division narrows certain classes; a UN/NA number identifies a specific regulated shipping entry. NA numbers are identification numbers used for North American transportation entries. For placarding, Table 1 materials generally require placards without the Table 2 weight exception; qualifying non-bulk Table 2 materials may use the 1,001-lb aggregate gross-weight exception for highway or rail. For non-bulk packages containing two or more Table 2 categories requiring different placards, a DANGEROUS placard may be used instead of separate Table 2 placards (§172.504(b)); this does not replace Table 1 placards, and 2,205 lb or more of one Table 2 category loaded at one facility requires that category’s own placard.

1Hazard classBroad transportation hazard category, such as Class 3 flammable liquids.
2DivisionA more specific hazard within selected classes, such as 2.1 flammable gas.
3UN / NA numberIdentification number tied to a specific Hazardous Materials Table entry.
Before you ship

How to Verify a DOT Hazard Classification

  1. 1
    Start with the exact material and condition.

    Concentration, physical state, wetting, chemistry, packaging configuration, and other details can change the applicable entry.

  2. 2
    Review SDS Section 14.

    Use it as a starting point for transport information, not as a substitute for checking the current regulation.

  3. 3
    Verify the proper shipping name in 49 CFR §172.101.

    Confirm the identification number, hazard class/division, packing group when assigned, and applicable special provisions.

  4. 4
    Check the shipment-specific requirements.

    Packaging, quantity, mode, labels, placards, marks, exceptions, and documentation can depend on the exact shipment.

Each person offering hazardous material for transportation is responsible for the applicable pre-transportation functions they perform or are required to perform, including proper classification and preparation of the shipment. Hazmat employees must be trained as required by 49 CFR Part 172, Subpart H.